Oracle Reports 9i - Problem with Displaying Chinese Characters

We have configured our report server such that generated pdf of the
reports were able to display chinese characters using Arial Unicode MS.
But when we change the font to Ming(for ISO10646), we encounter errors
saying "There was an error processing a page. There was a problem
reading this document (122)". We greatly appreciate any help in solving
this problem of ours.

Some info about our setup.

We use AMERICAN_AMERICA.UTF8 for our NLS_LANG. Ming(for ISO10646)
(filename is MING_UNI.TTF) should be a unicode font. From the site
"..The ISO 10646 standard and Unicode are code-to-code identical.
Unicode can be regarded as the implementation version of the ISO 10646
standard. Therefore, products supporting Unicode also support the ISO
10646 standard."

We have an entry under [PDF: Subset] "Arial Unicode MS" =
"ARIALUNI.TTF". For using the Ming font, we have "Ming(for ISO10646)" =
"MING_UNI.TTF".

We have both font files copied to one of the directories in the
report path.

We have Acrobat Reader 6 in the report server with both Simplified
Chinese and Traditional Chinese language packs installed.